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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f2ab5e8ad317a44ee6e4da618de58c0bf1fc6a319e89c91b2581f87eeda87f' 
  AND token = 'mcSOU3ZNVODb4VxyhuQMFLauunu/pizxv8PKTJ5h90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}